Observation: Turnagain

Location: Seattle Ridge

Route & General Observations

Seattle Ridge – up to 3,200’

Red Flags
Red flags are simple visual clues that are a sign of potential avalanche danger. Please record any sign of red flags below.
Obvious signs of instability
Recent Avalanches?No
Collapsing (Whumphing)?Yes
Cracking (Shooting cracks)?No
Observer Comments

Collapsing on Seattle ridge (new slab), 1 large collapse ~ 30m radius, and several smaller collapses. This collapsing was of the new wind slabs sitting on a thin crust sitting on facets.

Weather & Snow Characteristics
Please provide details to help us determine the weather and snowpack during the time this observation took place.

Cool temps, moderate to strong winds out of the West and South (see VIDEO and photos), mostly sunny with increasing clouds late in the day. Occasional flurries after 5pm-no accumulation.

Snow surface

2,000-3,000’: 2-6” new snow, pockets of wind slab up to 8” thick - non reactive
1,000-2,000’: thin crust on the ground (thin overall coverage)


Hand shears and pits between 2,300' and 3,200' showed slabs scattered about in pockets and generally non reactive. We found this variable pattern on East and North aspects.

Photos & Video
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